A magnetic fluid with adjustable stability and its preparation and recovery method

A magnetic fluid and stability technology, applied in the direction of magnetic fluid, inductor/transformer/magnet manufacturing, electrical components, etc., can solve problems such as water pollution, contact injury, secondary pollution, etc.

Active Publication Date: 2021-05-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the magnetic fluid prepared by the above-mentioned method has the following obvious deficiencies: one is that the process of improving the dispersion of magnetic nanoparticles by the surfactant is irreversible
For example, in terms of wastewater treatment, many surfactants such as amine surfactants have contact damage to the human body, and a very small amount can cause serious water pollution. If the ferrofluid carrier liquid contains surfactants and the surfactants The ferrofluid of modified magnetic nanoparticles is difficult to recover from water, which will cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The magnetic fluid with adjustable stability in this embodiment is specifically prepared by the following steps:

[0038] 1) Alkaline co-precipitation method to synthesize magnetic nanoparticles.

[0039] a) 100mL deionized water is passed through nitrogen to remove oxygen;

[0040] b) Add FeSO 4 ·7H 2 O (1.39g, 5mmol) and FeCl 3 ·6H 2 O (2.70g, 10mmol);

[0041] c) adding 50mL of ammonia water dropwise;

[0042] d) After the dropwise addition, stir vigorously and heat in a water bath at 80°C for 30 minutes;

[0043] 2) Modification of magnetic nanoparticles with branched polyethyleneimine.

[0044] a) Add 50mL PEI solution (40g / L) dropwise to the above solution;

[0045] b) After the dropwise addition, ultrasonic, vigorously stirred, and heated in a water bath at 80°C for 30 minutes;

[0046] c) After the product is collected, it is separated by a magnet, washed several times with deionized water, and the product is resuspended in 40 mL of deionized water for ...

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Abstract

The invention belongs to the field of magnetic nanomaterials, and discloses a magnetic fluid with adjustable stability and its preparation and recovery method, wherein the magnetic fluid with adjustable stability is mainly composed of magnetic nanoparticles modified by cationic polymers dispersed in a carrier liquid Constituted, the cationic polymer has an amino group; for the magnetic fluid, the stability of the magnetic fluid can be adjusted by adjusting the pH value of the magnetic nanoparticle-carrier liquid overall solution system. The present invention constructs magnetic fluid by modifying magnetic nanoparticles with cationic polymers, and the magnetic nanoparticles modified by cationic polymers can be highly dispersed in carrier liquid; the protonation of cationic polymers can make the surface of magnetic nanoparticles positively charged, and then can The electrostatic interaction between particles overcomes the agglomeration effect between particles, making the magnetic fluid stable; and the stability of the magnetic fluid is adjustable. By adjusting the stability of the magnetic fluid, the application field of the magnetic fluid can be expanded, making the magnetic fluid suitable for different application requirements.

Description

technical field [0001] The invention belongs to the technical field of magnetic nanometer materials, and more specifically relates to a magnetic fluid with adjustable stability and a preparation and recovery method thereof. Background technique [0002] Magnetic fluid is a liquid functional material, which is composed of a carrier liquid and nano-scale magnetic particles, and has both the fluidity of a liquid and the magnetism of a solid. Compared with ordinary liquids, ferrofluids exhibit many special magnetic, optical, and electrical phenomena under the action of an external magnetic field, such as magnetic targeting properties, birefringent optical properties, and high-efficiency heat conduction and enhanced heat transfer. It has broad application prospects in many fields such as medical treatment, sealing, mineral processing, and pollution control. [0003] Since the magnetic particles in the ferrofluid are at the nanometer level and have high surface energy, obvious ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/44H01F41/00
CPCH01F1/44H01F41/00
Inventor 曹全梁陈竞舸韩小涛李亮
Owner HUAZHONG UNIV OF SCI & TECH
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